Fatty acid composition of pectoralis muscle membrane, intramuscular fat stores and adipose tissue of migrant and wintering white-throated sparrows (Zonotrichia albicollis)

The Journal of Experimental Biology
J M KlaimanChristopher G Guglielmo

Abstract

The fatty acid composition of muscle membrane phospholipids and fat stores may affect migration performance in birds. The purpose of this study was to investigate seasonal changes in the fatty acid composition of (1) pectoralis muscle phospholipids, (2) intramuscular triglyceride stores and (3) adipose tissue triglycerides in free-living white-throated sparrows (Zonotrichia albicollis). During migratory seasons there was an increase in the n-6:n-3 ratio of muscle membrane phospholipid fatty acids without a change in the proportion of unsaturated fatty acids. This change was driven mainly by an increase in the proportion of 18:2n-6 and a decrease in the proportion of 22:6n-3. An increase in the proportion of 18:2n-6 was also observed in the intramuscular and adipose tissue triglyceride stores during the migratory seasons. These increases in 18:2n-6 were offset by a decrease in 16:0; resulting in an elevated proportion of unsaturated fatty acids and elevated double bond index in both fat stores of migrants. The elevated levels of 18:2n-6 in migrant fat stores indicates a high dietary component of this fatty acid, as white-throated sparrows feed mainly on tree seeds and some insects during migration and may not have access to a di...Continue Reading

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Citations

Dec 15, 2010·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Edwin R PriceChristopher G Guglielmo
May 12, 2011·Integrative and Comparative Biology·Christopher G Guglielmo
Jun 22, 2010·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Edwin R Price
Jun 26, 2013·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Miriam Ben-HamoBerry Pinshow
Mar 9, 2018·The Journal of Experimental Biology·Christopher G Guglielmo
Jan 10, 2019·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Morag F Dick, Christopher G Guglielmo
Jun 16, 2019·Die Naturwissenschaften·Christian C VoigtShannon E Currie
Feb 15, 2013·The Journal of Experimental Biology·Liam P McGuireChristopher G Guglielmo
May 22, 2021·Biological Reviews of the Cambridge Philosophical Society·Matthias PileckyMartin J Kainz

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